MIPS: dspr2: added optimization for function FilterLoop24
MIPS: dspr2: added optimization for function FilterLoop24

affected functions: VFilter16i, HFilter16i, VFilter8i and HFilter8i

Change-Id: I5d2bc7716e60e048a33d630fe4a86011bfb6d42e

PKRoma/libwebp,abwiz0086/webm.libwebp,altogother/webm.libwebp,zofuthan/libwebp,ericmckean/webm.libwebp,ttyangf/libwebp,redengineer/libwebp,abwiz0086/webm.libwebp,comoyo/gonzo-libwebp,kim42083/webm.libwebp,ttyangf/libwebp,redengineer/libwebp,Acidburn0zzz/webm.libwebp,gshORTON/webm.libwebp,iniwf/webm.libwebp,ttyangf/libwebp,comoyo/gonzo-libwebp,imazen/libwebp,jacklicn/libwebp,jiehu5114/libwebp,kim42083/webm.libwebp,Suvarna1488/webm.libwebp,webmproject/libwebp,kalli123/webm.libwebp,webmproject/libwebp,Aexyn/libwebp,ya7lelkom/libwebp,comoyo/gonzo-libwebp,ttyangf/libwebp,Maria1099/webm.libwebp,Maria1099/webm.libwebp,kim42083/webm.libwebp,gshORTON/webm.libwebp,imazen/libwebp,comoyo/gonzo-libwebp,Maria1099/webm.libwebp,Aexyn/libwebp,ericmckean/webm.libwebp,abwiz0086/webm.libwebp,reimaginemedia/webm.libwebp,rxl194/libwebp,abwiz0086/webm.libwebp,PKRoma/libwebp,altogother/webm.libwebp,kalli123/webm.libwebp,webmproject/libwebp,Suvarna1488/webm.libwebp,ya7lelkom/libwebp,kalli123/webm.libwebp,ya7lelkom/libwebp,imazen/libwebp,PKRoma/libwebp,imazen/libwebp,Acidburn0zzz/webm.libwebp,jiehu5114/libwebp,jiehu5114/libwebp,Acidburn0zzz/webm.libwebp,matanbs/webm.libwebp,comoyo/gonzo-libwebp,reimaginemedia/webm.libwebp,jacklicn/libwebp,webmproject/libwebp,yohunl/libwebp,matanbs/webm.libwebp,altogother/webm.libwebp,zofuthan/libwebp,iniwf/webm.libwebp,reimaginemedia/webm.libwebp,jacklicn/libwebp,Suvarna1488/webm.libwebp,matanbs/webm.libwebp,redengineer/libwebp,redengineer/libwebp,iniwf/webm.libwebp,PKRoma/libwebp,kleopatra999/webm.libwebp,altogother/webm.libwebp,Aexyn/libwebp,jacklicn/libwebp,kim42083/webm.libwebp,Acidburn0zzz/webm.libwebp,rxl194/libwebp,ericmckean/webm.libwebp,yohunl/libwebp,zofuthan/libwebp,kleopatra999/webm.libwebp,altogother/webm.libwebp,jiehu5114/libwebp,gshORTON/webm.libwebp,ericmckean/webm.libwebp,yohunl/libwebp,ericmckean/webm.libwebp,Suvarna1488/webm.libwebp,redengineer/libwebp,PKRoma/libwebp,comoyo/gonzo-libwebp,webmproject/libwebp,matanbs/webm.libwebp,rxl194/libwebp,kalli123/webm.libwebp,iniwf/webm.libwebp,abwiz0086/webm.libwebp,zofuthan/libwebp,kleopatra999/webm.libwebp,jacklicn/libwebp,Suvarna1488/webm.libwebp,yohunl/libwebp,Aexyn/libwebp,gshORTON/webm.libwebp,yohunl/libwebp,kleopatra999/webm.libwebp,Maria1099/webm.libwebp,ya7lelkom/libwebp,Acidburn0zzz/webm.libwebp,rxl194/libwebp,Maria1099/webm.libwebp,imazen/libwebp,matanbs/webm.libwebp,reimaginemedia/webm.libwebp,comoyo/gonzo-libwebp,reimaginemedia/webm.libwebp,PKRoma/libwebp,gshORTON/webm.libwebp,iniwf/webm.libwebp,kalli123/webm.libwebp,ya7lelkom/libwebp,ttyangf/libwebp,Aexyn/libwebp,rxl194/libwebp,jiehu5114/libwebp,kim42083/webm.libwebp,kleopatra999/webm.libwebp,zofuthan/libwebp